Liquid-supply system



March 25, 1930. DEAN ET AL 1,752Q261 LIQUID SUPPLY SYSTEM Filed July 25, 1927 48heets-Sheet 1 [urea fa rs March 25, 1930. G. DEAN ET AL LIQUID SUPPLY SYSTEM Filed y 192'? 4 Sheets-Sheet .2

MarchZS, 1930. DE N ET AL LIQUID SUPPLY SYSTEM Filed July 25. 1927 4 s e s-s eet s March 25, 1930. DEAN ET AL 1,752,261

LIQUID SUPPLY SYSTEM Filed July 23, 1927 4 Sheets-Sheet 4 Patented Mar. 25, 1930 e oRGE'DEAN, F ARMifHonPE, NEAR DONC'ASTEB, AND HENRY AINSLEY, or SEA- SCALE, ENGLAND; sit-in AINSLEY AssIGNon :ro SAID DEAN L ieviii-surrmz sYsT E M V K piicafibn fiid, mats, 1i','eria;1f1vo.-268,064, an d in Great Britain July so, 1926.

l ll'Qd-n r .o Actiorc'hngto this invention, new; is eniheic nhi l a i bpr 4 Eie i v. r I ml"??? 1 i "i i e twn.p i

otFig ure 1 showin the dispos i 'duii bm t ev# 9 11 1 lqmdp t ine s1 v ed' fisto'h w v.new, 0 12- ;gpe'r-t 5'1. ijigi ie 9 being" a further develo ment 'In' cair ihg butthe e ent-om a fprerried fl eensl ere- 1 view of ihdtlifiedr eriengment illustrated in Figures 1-3 is to employ a single pump 2 which may be mounted centrally on a base3 or if preferred within a container divided by partitions into compartlnents each adapted to hold a different liq iiol', Thus any convenient number of compartments may lie-provided around the pump, or they may be at a distance vfroin it and connected to it hy the commie-,4.

An important feature of the ump isthat the piston 5hr plunger employed'is adapted to rnake close Contact with the end wall or cover" or head 6 of the working end of the cylinder 7 If desired; nie'ans o'n the-plunger or end wall would be employed to make the contact forcibly, so that the liquid therein may be completely expelled from the cylinder. Also means are provided for closing or blockin ofi theclearaiiCespaCes created by the inlet and outlet passages froin the pump.

Qoiineeting the pu mp 2with the interior of each liquid compartment is a jsu'etion pipe 4L jointed 0b, the end cover 6 of the pump and controlled by an inlet valve .(not shown) which may bea hall in a valveochainber at thefoot of the pipe 4 or atan intermediate part thereof. Thesuction pipe 4: comihunicfateswith the interior of the pump 2 through a port 8' in the end cover 6 within which is a seating for a out oiflv alvei- This latter is a conical plug 9 so shaped that when closed down mu e seating it fills exac'tlythe orte level with the innerend of the co ers ofthe' eylinder. Thus, whenlthis valve 9 (which may be'actuated by meansprojec'ting out of the end wall of the cylinder,such 'as thelever lever in one direction withdraws the valve from its seating) v is closed, the whole of the whilst thei contactfof the'fpiston 5 with-the end 6 of the cylinder eliiiiinates all :clearance'therei also Any desired: numberfof v r valves oontrolling the suction pipes to the pump may be spaced around the cover 6.;

'. In. F e 2 l pp bnln t i fi n is 10, which isattaehed to aguided'exteiision 11 of the cutoff valve 9iso that movement of the 'j clearance space due to the port 8 i s filled, V

are closed. The end of the delivery valve is also seen and the remaining portion around the valves 9 is in section.

In Figure 4: is shown a modification of the cut-off valve illustrated in Figures 1-3. Here the valve is a cylindrical plug having its axis inclined to the cylinder bore, and its inner end 26 is bevelled accordingly to lie, when seated, level with the inner surface of the cover 6. It may be operated by a lever 10 as previously. described.

A modification of the valve is shown in Figure 5. In this the valve 27 is of the disc type having holes 28 and 29 to permit the escape of any liquid trapped before the valve actually closes. To uncover the port 8 it moves axially, its actuating means being the screw 30 or other means having similar function. V A further modification and arrangement of this valve is shown in Figure 8. The axis of this valve 31 is inclined to the cylinder bore and the inner end 32'is shaped so as to. conform to the part-spherical ended piston 5 when the valve is seated.

In Figure 7 a cut-off valve 35, broadly similar tothat in Figure 4, has its axis at rightangles to the pump axis. It enters the side of the pump and part of the bevelled portion 36 seats on a correspondingly bevor detachable heads or covers having, at

spacedintervals around them, connections for each of the various liquid compartments,

and each connection may include a suction and delivery valve and a cut-off valve to isolate these valves from the pump.

With any of the-arrangements illustrated, the-delivery valve 19 from the, pump can be 7 arranged centrally in the end wall or head 6 andmaybe of any preferred kind such as is shown in Figure l, in which, a plug 20 having at one end a conical portion seating in the end wall of the cylinder, whilst the 7 formed betweenthe. valve when lifted and other end has an axial recess communicating by lateral passages with the annular space i its seating. A spring-21 normallykeeps the valve on its seating, although if. preferred 1 positive seating means Inay be employed;

WVith this type of valve, the discharge of liquid fromthe pump is greatly facilitated. Altern atively,'a ball type deliveryvalve as illustrated in Figure' l may be used, in. which the ball 22 is normally keptagainst its seat 3 03 ISPIi lg 24. y v

form an indicating device.

. By returning to the top of the Operation of the pump in Figure 1 is dishaft operable by the handle 4:5, and an adjustable stop 46 limits the travel of the piston 5 so that measured quantities of'liquids may be withdrawn. To maintain atmospheric pressure on the top side of the piston a vent is provided at 47in a casingenclosing. the rack. The piston 5 may beprovided with scraper rings 48 so as to ensure complete discharge from the pump.

In Figure 4 there is no direct mechanical action upon the pump 2. Suction and pressure are applied to the piston 5 alternately by any known means through a port 49 in the top of the pump cylinder.

. A valve 50 is fitted to the piston 5,'and remains open during suction, thus facilitating exit of air from under the piston. 7 When the liquid reaches the piston 5 the valve 50 closes and an extension 51 operated by this valve protrudes from the top of the cylinder to the delivery stroke the valve 50. opens and any liquid left in or adhering to thedelivery valve is completely expelled.

As a further means for-Withdrawing air during suction from the underside of the piston, and more particularly when a working fluid is used in the top portion of the cylinder, a modified form of dual piston, such as is illustrated in Figure 8, is used. In this construction the piston is in two parts 52 and 53 and the valve 5O has a seating in the lower portion 53. When working fluid is drawn from the top'of the cylinder 7 -the suction thus created causes the piston 52, 53 to rise and open the valve 50, and any air below the piston is accommodated in the space 54 between the two piston parts 52 and 53, the valve50 closing when the liquid from the container reaches it. r r

withdrawn working fluid, the contents below the piston are dischargedand the valve'50 again opens. Thus the expulsion of the contents 54 scavenges. the delivery valve. 7 i

If, when operating the pump, the amount of air in the pipes' 'exceeds'the capacity of the space 54; between the two piston parts 52,

cylinder the 53, or should the suction in this space be I insufficient to withdraw all the'air from underrthe piston '53 and so allow the liquid to reach the lower surface thereof and close the valve 50, these difficulties may be overcome by a slight modification of the piston and associated parts.

Such an arrangement is shown in Figure ,9, in which a dual piston 64, 65 is, provided l with a valve 66 (corresponding to- .the'valve 50 in Figure 8) in the lower portion65, and

the latter has a stem 67 which extendsslidably into a hollowpart 68 of the upper pon J purpose. j

returned to the lower part 65, and in so doing the contents of the space 71' are discharged through the ball valve 70, and thereafter the part 64- is raised and any remaining air is drawn through the valve 69 from beneath the piston. These movements may be repeated until. the incoming liquid from the containers reaches the lower piston part 65 and thereby closes the valve 66, when a full measure will be drawn into the pump.

By these means the necessity for discharging partial quantities of liquid previous to making a further suction stroke is obviated and ensures a correct measure being obtained before any discharge from the pump takes place.

As a further means to prevent premature discharge of liquid through the delivery valve 73 during reciprocation of the piston part 64, a lever such as 7 4 pivoted at 75 bears at one end on the valve 7 3 and keeps it upon its seating until the correct measure is drawn into the pump and is thereafter released during the delivery stroke.

As before, the closing of the valve 66 may operate an indicating device, showing that a full charge has been drawn into'the pump.-

A further arrangement is to slide the upper piston inside the lower piston, i. e., a piston.

within a piston. With any type of dual piston, the upper portion can be 1 operated mechanically if desired, as, bymeans of a rack-and-pinion. q

It will be seen, therefore, that with apparatus of this kind any liquid can be readily supplied on demand, and the pump and its clearance spaces can be so effectively emptied or isolated that there is no risk of objectionablecontamination of two or more different be obtained by opening the necessary combination'of cut-off valves. Wherea definite mixture of liquids is desired the opening of the cut-off valves may be graduated for this These pumps may liquids may be fed to the pump'vessels and/or delivered therefrom by-pressure, gravity, or

suction.

As an'alternative to the foregoing arran ements,a separate pump may be provided or each liquid, with the axes of their plungers arranged either radially'or cylindrically in a circle,-or grouped, so that a centrally mounted be so modified that As a further alternative, instead of a mechanical operation for the separate pumps, they could be operated by fluid pressure developed in a central pump from-which branch passages, selectively operable at will, could convey the pressure to the pump controlling the desired kind of liquid. I

The invention provides for the neat storage and distribution of a number of brands of liquids, and, as the pumps in each case may be adapted to supply any measured quantities, the necessity for separate measuring apparatus for each liquid is avoided.

What we claim as our invention and desire to secure by Letters Patent of the United States is 1. In a liquid supply system, the combination of a pump provided with a piston which completely fills the clearance space within its cylinder, a head for the pump provided with a plurality of separate conduits adapted to be connected to containers for various liquids, said head containing a plurality of cut off valves adapted to control the conduits in which each cut-off valve is in the form of a plug, movable in a direction axially with respect to its seating, which seating is around the conduit at the latters junction with the pump wall, and the part of the valve exposed to the interior of the pump is shaped "to. conform to the surface of the pump wall;

2. In a liquid supply system, the combination of a number of separate conduits adapted to be connected to containers for various liquids, a pump provided with a piston which completely fills the clearance space within its cylinder, means in thehead of the cylinder adapted to control the withdrawal of the predetermined liquid, comprising, a radially arranged conical cut-off valve, adapted when closed to fill any clearance existing between the wall of the vessel and the piston therein. p In testimony whereof we have signed our names to this specification. h

' Y .GEORGE DEAN.

HENRY AINSLEY. 

